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iodine/iodide etchant

iodine/iodide etchant

iodine/iodide etchant

(OP)
I have a situation where iodine/KI was used as an etchant, but vapours escaped and caused corrosion.  However no traces of iodine can be detected on the corroded surfaces.  Is this to be expected?  Would iron iodide be unstable and the iodide disappear over time?

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